英文關鍵字
air
aircraft
airliners
airlines
airplane
airports
alertness
ambulance
assistance
aviation
business
clothing
day
emergency
engine
gray
green
ground
healthcare
jets
land
male
man
medical
medicine
motion
objects
outdoors
people
plane
rescue
responsibility
runway
services
single
siren
stationary
terminals
traffic
transport
transportation
travels
vehicle
white